I've been compiling my own list of missing persons websites, and just now I came across one, created by a fellow Websleuther, that has an entry about Anna with one or two inaccuracies. Here's the link:
http://missingme.2007.angelfire.com/anna_waters.html
First, a small inaccuracy - Anna's half brother is described as her step brother. Second, there is a reference to Anna's father and his "homosexual lover". While this has been speculated upon, I didn't think Anna's family would want it stated as fact in a description of the case. I was not sure how Anna's family would want to approach this with the website owner, so I thought I would post it here.
Just noticed another thing - it mentions the couple in the car driving alongside Anna as she played in the yard. I thought she was out for a walk with her brothers? The wording also seems to imply that the couple in the car were seen on the same day Anna disappeared, instead of a month earlier.
P.S. In case anyone's confused about the title of the website that comes up (they mainly deal with the unidentified), this is in their "Missing Persons Spotlight" section.